CVE-2026-101005 October CMS - Server-Side Request Forgery

October CMS <= 4.3.4 contains a server-side request forgery caused by improper validation in validateExternalImageHost function in System/Classes/ResizeImages.php, letting remote attackers forge server requests, exploit requires crafted request.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.30% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server-Side Request Forgery
Impact
Server Side Request Forgery
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published
28 September 2026
Updated
15 October 2026
Weakness
CWE-918

Vendor fix

Upgrade to version 4.3.5.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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